Those of you who are already familiar with and are using Robin's "Encyclopedia of Marine Gastropods", you want this book need read no further.. It follows the same format as "gastropods" this book illustrates in color more than 2000 species of marine molluscs and contains more than 5000 photos to help with the identification of color forms. There is almost no text, the key beneath each plate provides minimal information about the shells and lets the pictures do the talking.